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Interface Connectivity 77

One of the interface conﬁguration commands that behaves differently in WAAS versus IOS

is the bandwidth command. The bandwidth interface conﬁguration command in WAAS

is used to specify the speed of the interface when auto-negotiation is disabled. The way

in which the standby interface command is used is another important difference between

WAAS and IOS. In IOS, the standby interface command is used for conﬁguring the Hot

Standby Router Protocol (HSRP) feature, while in WAAS it is used to conﬁgure the standby

interface feature, described in the next section. You can see from the output in Example 4-1

that the remaining WAAS interface conﬁguration commands are similar to the corresponding

IOS interface conﬁguration commands.

You can explicitly conﬁgure the interface with an IP address and subnet mask, or the WAE

can acquire an IP address using DHCP. Each WAE interface can also be conﬁgured with

multiple secondary IP addresses. It is also possible for the same interface to acquire an IP

address through DHCP, and have multiple secondary IP addresses statically conﬁgured. By

default, the interfaces on a WAE are administratively disabled, and are automatically

enabled when a valid IP address is conﬁgured.

Each WAE interface is primarily referenced using the standard Cisco IOS interface naming

scheme:

<interface-name> <slot/port>

This is how WAE interfaces are referred to during conﬁguration through the CLI or GUI.

The interfaces also have an internal name by which the Linux operating system knows

them. Table 4-1 shows the mapping between the internal and external interface names.

Understanding the internal name of an interface is useful for understanding system log

messages and using internal operating system tools, such as Ethereal or Tcpdump, which

are useful for capturing trafﬁc for ofﬂine analysis.

Just like the interface conﬁguration, the outputs of interface show commands in WAAS are

similar to Cisco IOS. Example 4-2 shows the output from the show interface command in

WAAS.

Table 4-1 WAE External and Internal Interface Names

IOS Name Internal Name

gigabitEthernet 1/0 eth0

gigabitEthernet 2/0 eth1

Example 4-2 WAE show interface Command Output

AST6-CCO-02# show interface gigabitEthernet 1/0

Type:Ethernet

Ethernet address:00:11:25:AB:43:28

Internet address:10.88.81.2

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